PTG is a heuristic algorithm that can find the minimum number of distinct haplotypes based on the criterion of keeping all genotypes resolved during tree-grow process.
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Zhenping Li, Wenfeng Zhou, Xiangsun Zhang and Luonan Chen.
A parsimonious tree-grow method for haplotype inference.
Bioinformatics, Vol. 21, No. 17, pp. 3475-3481, 2005.